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Quarterly Financial Data -- Unaudited (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 35,788 | $ 33,488 | $ 30,131 | $ 25,158 | $ 25,313 | $ 24,614 | $ 25,446 | $ 24,182 |  |  |
Interest expense | 4,786 | 3,401 | 2,677 | 1,963 | 1,838 | 1,741 | 1,493 | 1,410 | $ 12,827 | $ 6,482 | $ 4,292
Net interest income | 31,002 | 30,087 | 27,454 | 23,195 | 23,475 | 22,873 | 23,953 | 22,772 | 111,738 | 93,073 | 71,204
Provision for loan losses | 3,184 | 2,551 | 1,877 | 1,055 | 2,411 | 1,489 | 1,840 | 1,722 |  |  |
Net interest income after provision for loan losses | 27,818 | 27,536 | 25,577 | 22,140 | 21,064 | 21,384 | 22,113 | 21,050 | 103,071 | 85,611 | 68,378
Other income | 11,647 | 7,919 | 8,361 | 7,487 | 7,210 | 7,661 | 7,969 | 7,496 | 35,414 | 30,336 | 26,912
Other expense | 26,320 | 24,490 | 20,796 | 18,374 | 19,152 | 17,912 | 17,955 | 19,202 | 89,980 | 74,221 | 61,510
Income before income taxes | 13,145 | 10,965 | 13,142 | 11,253 | 9,122 | 11,133 | 12,127 | 9,344 | 48,505 | 41,726 | 33,780
Total | 3,206 | 2,731 | 3,105 | 2,863 | 4,497 | 3,538 | 3,927 | 3,080 | 11,905 | 15,042 | 11,940
Net income |  |  |  |  | 4,625 | 7,595 | 8,200 | 6,264 | 36,600 | 26,684 | 21,840
Dividends on preferred shares |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 0 | 825
Net income available to common stockholders | $ 9,939 | $ 8,234 | $ 10,037 | $ 8,390 | $ 4,625 | $ 7,595 | $ 8,200 | $ 6,264 | $ 36,600 | $ 26,684 | $ 21,015
Basic earnings per common share | $ 0.62 | $ 0.54 | $ 0.72 | $ 0.66 | $ 0.37 | $ 0.61 | $ 0.66 | $ 0.50 | $ 2.53 | $ 2.13 | $ 2.07
Diluted earnings per common share | $ 0.62 | $ 0.54 | $ 0.72 | $ 0.66 | $ 0.37 | $ 0.61 | $ 0.66 | $ 0.50 | $ 2.52 | $ 2.13 | $ 2.05

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